What does this spec mean?

[Krayge2469]

also remember, RMS tends to be a measure of constant power. In 12-volt audio, RMS is a very important factor since you have a constant output going to your subs, tweets and everything in between. with home audio, your audio is gonna be interspersed with periods of no sound or very low sound as well. RMS doesn't factor in quite as highly due to the lack of a "need" for constant power feed. Thus, in home audio RMS is a factor to look at, but it's not the end-all of performance to look at. look more for frequency range, signal-to-noise ratio and put RMS somewhere after those